Trouble installing app on iPad

I am new (1 day ) homeassistant have attempted to install on three devices 2 iPad and iPhone was able to successfully install one iPhone and one iPad however I the other iPad it doesn’t locate the IP address when i install it manually it fails and I get the following error code: NSURLErrorDomain -1009. Can anyone help me remember I am a very novice to this site so I am a helpless dummy